<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>内置对象Number</title>
		<script type="text/javascript">
			let lap = 123;
			let str = lap.toString();  //将int转换成Number
			console.log(typeof(lap));
			console.log(typeof(str));
		</script>
	</head>
	<body>
	</body>
</html>